720318913 has 2 divisors, whose sum is σ = 720318914. Its totient is φ = 720318912.

The previous prime is 720318901. The next prime is 720319021. The reversal of 720318913 is 319813027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373726224 + 346592689 = 19332^2 + 18617^2 .

It is a cyclic number.

It is not a de Polignac number, because 720318913 - 2⁵ = 720318881 is a prime.

It is not a weakly prime, because it can be changed into another prime (720378913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360159456 + 360159457.

It is an arithmetic number, because the mean of its divisors is an integer number (360159457).

Almost surely, 2^720318913 is an apocalyptic number.

It is an amenable number.

720318913 is a deficient number, since it is larger than the sum of its proper divisors (1).

720318913 is an equidigital number, since it uses as much as digits as its factorization.

720318913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 720318913 is about 26838.7576649889. The cubic root of 720318913 is about 896.4132610960.

The spelling of 720318913 in words is "seven hundred twenty million, three hundred eighteen thousand, nine hundred thirteen".